Development of a new process in high functioning ceramic core without shape deformation

A new process was developed to prepare a ceramic core with reasonable strength, and without shrinkage and shape deformation. In this work, a mixture of inorganic precursor composed of silicate and metal alkoxide was used to increase the strength of the core during the wax injection under about 50 °C and the casting processes under about 1300-1350 °C. In the case of the core prepared through the new process, the nominal fracture strength is 12 MPa because of the glass phase synthesized by the inorganic precursor. However, in the conventional process, the core shows the strength of about 6 MPa, as manifested by the sintering effect between starting particles occurring during heat treatment. In addition, the core sample prepared using the inorganic precursor is completely eluted in a sodium hydroxide solution, indicating that the new core process is reasonable for the fabrication of a ceramic core having high strength and crushability.